The real Celestion helps but it doesn't justify 550$. You should really go play one before commiting. If your looking for the classic Marshall sound I don't think you'll be satifsfied with it, but thats just my 2 cents. BTW is this an additional amp or replacing your main amp, or maybe your first amp. Just something to consider, weigh it's sound and price versus what you already have and against what your looking for. Through the years I never got the exact amp I wanted. I would get one that I liked enough and play it for a year or two or until I had money to upgrade to something I liked better. Maybe eventually I'll make it up to that Mesa Road King in Red Snakeskin tolex that I've been drooling over.